Portable hoist



May 2, 1933. D. E. WILLARD ET AL 7,

' PORTABLE HOIST Filed Dec. 13, 1929 I 3 Sheets-Sheet l flaw/a l? fla /4 724/ 367272615 Bfi Blake May 2, 1933. D. E. WILLARD ET AL.

PORTABLE HOI ST Filed Dec. 13, 1929 3 Sheets-Sheet 2 a; g 1W4 fiwmw 3 aka? May 2, 1-933.

D. E. WILLARD ET AL.

PORTABLE HOIST Filed Dec. 13, 1929 3 Sheets-Sheet 5 .WEE

E I 5 fimadfx Wilmd 6202x3513 @Ze Patented May 2, 1933 UN T D STATES DONALD E. AND DENNIS B. D. BLAKE, OI DANVILLE, ILLINOIS; SAID BLAKE Y PATENT OFFICE ASSIGNOB '10 SAD WILLARD PORTABLE HOIST Application filed December 13, 1929. Serial 80.413310.

The present invention relates to a portable hoist and particularly to a portable telescoping hoist which is operated by fluid pressure.

The hoist of the present invention is particularly useful in removing motors from airplanes and the like, and also in installing motors in airplanes and like vehicles.

,A hoistsuitable for installing motors in and removing motors from airplanes must be collapsible to an extent to allow moving of the same underneath the fuselage of the airplane when the same is at rest and extensible to a sufiicient height to enable lifting of the motor or engine out of the airplane upwardly of the fuselage for repair or replacement. v

Another requisite is that such a hoistmust be readily portable so as to be moved from place to place in both extended and collapsed condition.

An object of the present invention is to provide a portable telescoping hoist which is useful in connection with the removal of engines from aeroplanes and also in connection with the installation of engines in aeroplanes from the top sides of the same.

Another object of the invention is to provide a telescopin hoist with a plurality of telescoping mem ers which are vertically movable and which are actuated by fluid pressure.

A further object of the invention is to provide a portable telescoping hoist having telescoping cylindrical members which are actuated by fluid pressure and in which the telescoping members, fluid supply and pressure creating means are carried on a single vehicle or frame whereby the whole apparatus may be readily moved from lace to place in extended as well as collapsed condition.

A still further object of the invention is to provide a telescoping hoist with certain of the parts so arranged as to allow rotative movement of certain of the parts in order that a load-supporting boom may be rotated about the axis of the hoist as desired.

Another and further object of the invention is 'to provide a telescoping hoist which is economical to manufacture, strong and rigid in construction, readily adapted for the pur oses intended and one which may be real ilymoved from place to place.

The above, other and further objects of the invention will be apparent from the following description, accompanying drawings and appended claims.

Generally speaking, the invention contemto its mast section or member or rotating the mast section with the boom rigidly fastened to it.

An embodiment of the invention is illustrated in the accompanying drawings and the views thereof as follows:

Figure 1 is a side elevational view of a hoist in collapsed condition embodying the present invention.

Figure 2 is a top plan view of the apparatus illustrated in Figure 1.

Figure 3 is an enlarged-fragmental tional View taken substantially in the plane of line III-III of Figure 1.

Figure 4 is a fragmental vertical sectional view taken substantially in the plane of line IV-IV of Figure 2.

Figure 5 is an enlarged cross-sectional view taken on line V-V of Figure 4.

' Figure 6 is an enlarged fragmentalsectional view of the illustrated form of stop for limiting outward movement of the first or outermost telescoping mast member or section. a

Figure 7 is an enlarged sectional view taken in the plane of line VIIVII of Figure 4. 4

Figure 8 is an enlarged sectional view taken in the plane of line V'III -VIII of Figure 4.

The drawings will now be explained.

A wheel supported frame designated generall at A and consisting of a front casting 1 an rear casting 2 secured together by bolts 3is carried on two rear wheels 4 and 5 each supported on the stub axle 6 in the rear casting 2 and front wheels 7 and 8 carried on front axle 9.

The front wheels 7 and 8 are supported on knuckles having steering arm 10 which are connected by a reach rod 11.

A draw bar 12 is fastened to the front axle 9 and a steering bar .13 is fastened at one end of the draw bar 12 and at the other end to the reach rod 11 so as to steer the front wheels whenever the draw bar 12 is moved laterally as the apparatus is drawn along by suitable means.

The front casting 1 is provided with a semispherical collar 14: and the rear casting 2 with a semi-spherical collar 15 which terminate in flanges 16 and 17 respectively and the bolts 3 pass through the flanges 16 and 17. v

A cylindrical tank .B is embraced by the i collars 14 and 15 of the frame A and supportedin vertical position in the frame.

A bottom casting C having an outer annular upstanding flange 18 is attached to the lower end of the tank B. Casting C is provided with an inner annular flange 19 spaced izrwardly of the flange 18'and defines a well The tank or shell B is clamped securely in the frame A by engagement of the collars 14 and 15 as above described.

A cylinder D is arranged within the wall 19 of the bottom casting C concentrically with the tank or shell B and extends above the upper end of the shell B.

A flanged cap E fits over the upper end of the shell B and is provided with a central recess through which passes the cylinderD. The cap E is provided with an upstanding annular flange 21 spaced from the cylinder D to provide a sump for the collection of any fluid that may leak from the various members of the hoist. The cap is provided with an opening 22 so that this fluid may return into tank B.

The tank or shell B is described herein as the supply tank.

The lower end of the cylinder D is threaded as is the inner surface of the annular partition 19 to support the cylinder- D in threaded engagement with the cap C, thusmovable within the cylinder G. This cyhnsecuring the cylinder securely in position.

A plurality of telescoping members, three.

bein shown in the drawings, are arranged within the cylinder D for movement outwardly thereof in a manner to be later explained.

The outermost telescoping member F fits' snugly within the cylinder D and is provided with a head 23 at its inner end. The head may be integrally formed with the member or cylinder F or it may be fastened thereto in an suitable manner. The head 23 is provi ed with an enlarged axial opening 24. (Fig. 6.)

A ring 25 having a shoulder 26 about the opening therein is secured against the under side of the head 23. A cup washer 27 is clamped between the ring 25 and the lower surface of the head 23 which washer has a skirt extending downwardly within the cylinder D. The shoulder 26 of the ring 25 extends into the opening 24 of the head 23 and bears a ainst the inner surface of said 0 ening. T e ring 25 is secured to the hea by means of bolts 28 passing through the ring 25, cup washer 27 and threaded into threaded threaded onto the tube 29 and lies within the .opening 24 of the head 23.

,The stop nut 30 and the collar 32 cooperate with the tube 29 to retain the same connected to the head 23 for movement with the telescoping member F as the same moves upwardly and downwardly within the cylinder D. I

A rod 33 is threaded into the bottom casting C and extends through the opening in the stop nut 30 and has a head 34 larger than in a stop nut 30 for cooperating therewith to limit the upward movement of the cylinder or telescoping member F under pressure. The cylinder F is axially movable with respect to the-rod 33, the rod being stationary while the cylinder F moves.

Anotherte'lescoping member G is slidable within the member F. The lower end of the cylinder G has a head similar to that of head 23 in the cylinder F and is provided with a similar cup washer, ring, stop nut and collar for cooperating with a collar fastened to the upper end of the tube 29 for limiting upward movement of the cylinder G within the cylinderF.

"A third cylinder H is illustrated as axially and its upper end extending through the head stop nut, collar. and plate is such as to pro- 36 of the cylinder H and is provided inwardly of the head 36 of the cylinder H with a collar 38 for limiting upward movement of the cylinder H.

The rods 33, 29', and 37 are telescopically engaged so as to be nested when the mast is collapsed.

The heads of the various cylinders are provided with apertures 39 through which the fluid may pass for elevating the various telescoping cylinders. The fittings of the vide some space for the passage of fluid about the centrally disposed tubes or stops.

There are shown three axially movable telescoping cylinder sections F, G and H but it is to be understood that the invention is not to be limited to three sections as more or less may be used as desired and as circumstances warrant.

A cap 40 is supported on the upper end ofthe upper cylinder H and has an airvent 41 in the same. i y

A collar 42 surrounds the upper-end of the telescoping section H immediately below the cap 40 and is fastened to the section H by being threaded thereon or shrunk or in any suitable manner. The collar is provided with an overhanging flange 43 and ears 44.

Aboom 45 shown herein as an I-beam is riveted to the shelf 43 by the rivets 46 and has its web attached to the ears 44 by a bolt or rivet 47. A trolley 48 is movable along fastened thereto wherewith to lift loads.

The boom 45 may be swung about the axis of the telescoping cylinder because the section H being a cylinder is rotatable within the cylinder G. and likewise the cylinder G is rotatable within the cylinder F which in turn is rotatable within the cylinder D so that the boom as before stated may be rotated to any desired position irrespective of the height to which the same is raised.

The collar 42 supporting the boom 45 may if desired be arranged to rotate about the section H.

A collar 49 is disposed about the lower portion of the cylinder D and has fastened to it an adapter K to which may be removably secured a motor from an aerop ane or like vehicle in position for service. The collar 49 is provided with spaced ears 50 at the ends thereof which ears are drawn together in clamping engagement about the cylinder D by means of a bolt 51 passing through the ears and tightened in the usual manner.

Figure 4 illustrates one method of securing the adapter K to the collar 49. A mounting plate 52 is formed integrally with the collar 49 and is provided with a boss 53 having-a threaded opening. The adapter K is .58 to one of the flanges of the front casting 1 and is connected by means of a coupler 59 to a pump 60 supported also on the casting 1. The pump 60 and the motor 57 may if desiredbe fastened 'to a common base 61 which in turn is fastened tothe flange of the casting 1.

The pump 60 is utilized to force the liquid employed in the operation of this device from within the liquid supply tank B into the interior ofthe cylinder D for elevating the various telescoping sections.

Any suitable fluid may be employed but it is preferred to utilize oil.

The well between the outer flange 18 and inner flange 19 of the bottom casting C is designated 62.

A pipe 63 communicates with the well 62 to an opening in the bottom casting C as may be observed in Figure 3. The pipe 63 leads to one end of an oil strainer 64 while a pipe 65 leads from the discharge end of the oil strainer 64 to the inlet side of the pump 60.

A pipe 66 leads from the outlet of the pump 60 to a T-union 67 to one end of which is connected a relief valve 68 and to the other end of which a pipe 69 is connected with the other end discharging into a passageway 70 formed in the bottom casting C and communicating with the interior of the cylinder D.

The relief valve 68 is a pressure relief valve.

A pipe 71 leads from the pressure relief valve 68 to a T-union 72. A pipe 73 leads from the lower end of said union 72 into the well 62 of the bottom casting C where the same is in communication with the interior of the cylinder B. A pipe 74 leads from the union 72 into the well 20 communicating with the interior of the cylinder D. A stop-cock 7 5 is interposed in the pipe 74 between the T- .union 72 and the discharge end of pipe 74.

enough left over to provide for any loss in usage.

The hoist is moved to the place of use by being drawn by means of draw bar 12 whereupon the motor 57 is put in operation.

Operation of the motor 57 pumps fluid from the supply tank B through pipe 63, strainer 64, pump 60, pipe 66, T-union 67, pipe 69, duct 70 into the interior of the cylinder D. Continued operation of the pump will create pressure, will raise the telescoping sections F, and G and H to such height as may be desired. The maximum height to \vhich'these sections may be raised is determined by means of the stop rod 33 for the section F, tube 29 for the section G and tube 37 for the section H.

The parts are so arranged that when in fully extended positions the telescoping sections lie within one another in such manner as to be supported against swaying or any tendency of lateral movement out of the perpendicular. The sliding surfaces of the sections are in snug engagement and of uniform diameter so that there is no play possible of any of the sections with respect to any other.

The section F is stopped in its upward movement approximately half the height of the cylinder D or the stopping point might be below the mid-height of this cylinder. Likewise the other sections are stopped in upward movement at approximately mid-height of the supporting sections so that the whole mast when extended to maximum position is strong, rigid and will not bend or sway.

Continued operation of the pump 60 by the motor 57 will eventually ralse the various telescoping sections to the desired height. When the mast has reached its maximum travel upwardly it is full of oil or other fluid,

. yet the pump'is continued in operation to maintain the mast extended. The oil then is by-passed through the relief valve 68, pipe 71, pipe 73 and returned to the supply tank B. The relief valve 68 is a check valve to prevent the return of oil through the conduit 70 and upwardly through pipe 69 so that when maximum pressure has been reached within the cylinder D back flow throu h duct 7 0 and pipe 69 cannot ensue, the result beingthat the oil pumped through the pump passes through the relief valve 68 and back to the supply tank B.

When it is desired to lower the mast the stop-cock is opened whereupon, because of the weight of the parts and the force of gravity, the oil is forced outwardly from within the cylinder D through pipe 74, past stop-cock 75 into T-union 72, then through pipe 63 to the supply tank B.

The face 77 of the adapter K may be provided with bolt holes or lugs or both to which the fly wheel casting portion of the engine may be bo ted, support the engine or motor in position while work is being done on the the bolt tightened to hold t e en ine in such position. This arrangement ena les the motor or engine to be rotated to any position to facilitate work on the same.

The adapter K might, if desired, be removed and a platform secured to the collar 49 about the cylinder B to support workmen for temporary work on the aeroplane or like structure.

The frame A is so constructed as to support the hoist in mesh from elevated position with a load carried at the end of theboom 45 so that the same will not tip over. This is ac complished by providing a suflicient tread for the wheel supporting the frame or body.

The invention has been described herein more or less precisely as to details, yet it is to be understood that the invention is not to be limited thereby, as changes may be made in the arrangement and proportion of parts, and equivalents may be substituted without departing from the spirit and scope of the invention.

The invention is claimed as follows:

1. A portable telescoping hoist including in combination a wheel supported frame, said frame consisting of several castings, said castings being connected to provide a circular space, a cylinder clamped in said circular space by said castings, an end closure for said cylinder having an annular partition extending upwardly within said cylinder and spaced inwardly from the same, an inner cylinder fixed to said annular flange, relatively rotatable telescoping members arranged within said second mentioned cylinder, a rod secured to said end closure and extending through and into the outermost of said telescoping members for limiting upward movement thereof, said telescoping members having heads at the lower ends thereof with openings therein for the passage of fluid, every one of said telescoping members having an axial rod extending into menses cylinder and spaced inwardly from the same, an inner cylinder fixed to said annular flange, relatively rotatable telescoping members arranged within said second mentioned cylinder, a rod secured to said end closure and extending through and into the outermost of said telescoping members for limiting upward movement thereof, said telescoping members having heads at the lower ends thereof with openings therein for the passage of fluid, every one of said telescoping sections having an axial hollow rod extending into the next above telescoping section for limiting outward movement of said next above telescoping section with respect tothe preceding one, said rods being telescopically arranged, and fluid pressure means on said frame for moving said telescoping sections upwardly into fully extended position, said stop members for said several telescoping sections arranged to limit the outward movement of every section with respect to its surrounding section for providing lateral support for said sections when extended.

3. A portable hoist including a wheel sup- 1 ported frame, a vertically disposed cylinder clamped in said frame, a second cylinder secured within said first cylinder and spaced inwardly therefrom, the space between said cylinders constituting a fluid supply chamber,'a plurality of relatively rotatable telescoping members within said second mentioned cylinder, a rod fastened to the frame and extending through and into the outermost of the telescoping members for limiting upward movement of said member, said telescoping members having heads at the lower ends thereof with openings therein for passageof fluid, said outermost telescoping member having a tube secured axially therein in the head thereof and extending through and into the next above of the telescoping members and engageable with the head at the lower end thereof for limiting upward movement of said next telescoping member,

and like axial tube members carried by the successive telescoping members for limiting the upward movement of the next successive of said members, said axial tube members being telescopically arranged.

4. An extensible mast consisting of a plurality of sliding relatively rotatable telescopic cylindrical members, all of said members having the sliding surfaces thereof of uniform diameter throughout, the lower ends of all of said sliding members being provided with apertured heads lying wholly within the compass of the sliding surfaces of said members and having openings therein for fluid passage, a lower sliding member having an axially disposed hollow tube fastened to its head and extending upwardly through the head of the member next above, a stop on said tube above said last mentioned head engageable with said head for limiting upward County, Illinois;

movement of said next above member, an all of said sliding members being provided with similar axially disposed tubes cooperating with the next above members in the manner stated, said tubes being telescopically arranged so as to be nested when the mast is collapsed and forming braces for the mast when extended.

5. A portable telescoping hoist including in combination, a wheel supported frame, a cylinder clamped in said frame, an inner cylinder within said first-mentioned cylinder spaced therefrom to rovide with it a fluid supply chamber, re atively rotatable telescoping members arranged within said second cylinder, said first and second cylinders being closed at their lower ends, said telescoping members having end closures at their lower ends which closures have passa es for fluid, a rod secured to the end closure or the firstand second cylinders extending upwardly through and into the outermost of 'said telescoping members and engageable with th head thereof for limiting upward movement thereof, every one of said telescoping members having an upwardly extending axial rod secured to its head and extending into the next above telescoping member and engageable with the head of that member for limiting upward movement-of that member with respect to the preceding one, said stop rods being telescopically arranged for nesting when the members are collapsed and for affording axial braces to the members when extended, and fluid pressure means on said frame for moving said telescoping members upwardly into full extended position.-

In testimony whereo we have hereunto subscribed our names at Danville, Vermilion DONALD E. WILLARD. DENNIS B. D. BLAKE. 

